// JavaScript Document
(function (factory) {
    'use strict';
    if (typeof define === 'function' && define.amd) {
        // Register as an anonymous AMD module:
        define([
            'jquery',
            'jquery.ui.widget'
        ], factory);
    } else {
        // Browser globals:
        factory(window.jQuery);
    }
}(function ($) {
    'use strict';


    
    jQuery.extend({

    	 
    
    
        createUploadIframe: function(id, uri){
       //create frame
            var frameId = 'jUploadFrame' + id;
            
            if(window.ActiveXObject) {
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if(typeof uri== 'boolean'){
                    io.src = 'javascript:false';
                }
                else if(typeof uri== 'string'){
                    io.src = uri;
                }
            }
            else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io;  
        },
        handleError: function( s, xhr, status, e ) {  
            // If a local callback was specified, fire it  
                    if ( s.error ) {  
                        s.error.call( s.context || s, xhr, status, e );  
                    }  
      
                    // Fire the global callback  
                    if ( s.global ) {  
                        (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );  
                    }  
        },
        createUploadForm: function(id, fileElementId){
    		//create form 
    		var formId = 'jUploadForm' + id;
    		var fileId = 'jUploadFile' + id;
    		var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>'); 
    		var oldElement = jQuery('#' + fileElementId);
    		var newElement = jQuery(oldElement).clone(true);
    		jQuery(oldElement).attr('id', fileId);
    		jQuery(oldElement).before(newElement);
    		jQuery(oldElement).appendTo(form);
    	  
    		//set attributes
    		jQuery(form).css('position', 'absolute');
    		jQuery(form).css('top', '-1200px');
    		jQuery(form).css('left', '-1200px');
    		jQuery(form).appendTo('body');  
    		return form;
    	},

        ajaxFileUpload: function(s) {
            // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout  
    		s = jQuery.extend({}, jQuery.ajaxSettings, s);
    		var id = s.fileElementId;        
    		var form = jQuery.createUploadForm(id, s.fileElementId);
    		var io = jQuery.createUploadIframe(id, s.secureuri);
    		var frameId = 'jUploadFrame' + id;
    		var formId = 'jUploadForm' + id;  
            
    		if( s.global && ! jQuery.active++ ){
    			// Watch for a new set of requests
    			jQuery.event.trigger( "ajaxStart" );
    		}
    		
    		var requestDone = false;
    		// Create the request object
    		var xml = {};   
    		if( s.global ){
    			jQuery.event.trigger("ajaxSend", [xml, s]);
    		}            
            
    		var uploadCallback = function(isTimeout){  
    		// Wait for a response to come back 
    		var io = document.getElementById(frameId);
    		try {    
    		    if(io.contentWindow) {
    				xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
    				xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
    		      
    		    }else if(io.contentDocument) {
    				xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
    				xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
    		    }      
    		}catch(e){
    			jQuery.handleError(s, xml, null, e);
    		}

    		if( xml || isTimeout == "timeout"){    
    			requestDone = true;
                var status;
                
                try {
                	
                    status = isTimeout != "timeout" ? "success" : "error";
                    // Make sure that the request was successful or notmodified
                    if( status != "error" ){
                        // process the data (runs the xml through httpData regardless of callback)
                        var data = jQuery.uploadHttpData( xml, s.dataType );                        
                        if( s.success ){
                        	// ifa local callback was specified, fire it and pass it the data
                        	s.success( data, status );
                         };                 
                        if( s.global ){
    						// Fire the global callback
    						jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                        };   
                    }else {
                		jQuery.handleError(s, xml, status);
                    }
                } catch(e) {
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                };                
                    
                if( s.global ){
    				// The request was completed
    				jQuery.event.trigger( "ajaxComplete", [xml, s] );
    			};
                        

    			// Handle the global AJAX counter
    			if(s.global && ! --jQuery.active){
    				jQuery.event.trigger("ajaxStop");
    			};
                    
    			if(s.complete){
    			  s.complete(xml, status);
    			};                 

                jQuery(io).unbind();
                setTimeout(function(){
                	try {
    					jQuery(io).remove();
    					jQuery(form).remove();
    				} catch(e) {
    					jQuery.handleError(s, xml, null, e);
    				}
    			}, 100);
                xml = null;

                };
            }
            // Timeout checker
            if( s.timeout > 0 ){
                setTimeout(function(){
                    if( !requestDone ){
    	                // Check to see ifthe request is still happening
    	                uploadCallback( "timeout" );
                    }
                }, s.timeout);
            }
            
            try {
    			var form = jQuery('#' + formId);
    			jQuery(form).attr('action', s.url);
    			jQuery(form).attr('method', 'POST');
    			jQuery(form).attr('target', frameId);

    			if(form.encoding){
                    form.encoding = 'multipart/form-data';    
                } else {    
                    form.enctype = 'multipart/form-data';
                }
    			
                jQuery(form).submit();
            } catch(e) {   
                jQuery.handleError(s, xml, null, e);
            }
            
            if(window.attachEvent){
                document.getElementById(frameId).attachEvent('onload', uploadCallback);
            }
            else{
                document.getElementById(frameId).addEventListener('load', uploadCallback, false);
            }   
            return {abort: function () {}}; 
        },

        uploadHttpData: function( r, type ) {
            var data = !type;
            data = type == "xml" || data ? r.responseXML : r.responseText;
            // ifthe type is "script", eval it in global context
            if( type == "script" ) {
            	jQuery.globalEval( data );
            }
                
            // Get the JavaScript object, ifJSON is used.
            if( type == "json" ) {
            	//eval( "data = " + data );
            	data = jQuery.parseJSON(jQuery(data).text());
            }
                
            // evaluate scripts within html
            if( type == "html" ) {
            	jQuery("<div>").html(data).evalScripts();
            }
            
            return data;
        }
    });
 
}));


